What are the causes of main engine black smoke?

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What are the causes of main engine black smoke?..

Answer / muhammaddin

mostly it causes of due to failure of engine piston rings or
added impurity in fuel which does not burn properly

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What are the causes of main engine black smoke?..

Answer / manoj yadav

THERE MAY BE RESTRICTION IN AIR SYSTEM OR MAY BE FUEL
SYSTEM/PUMP IS MALFUNCTIONING. BECAUSE THE BLACK SMOKE IS
THE SYMPTOMPS OF INACCURATE AIR-FUL MIXTURE. IT MAY BE DUE
TO INACCURATE INJECTION TIMING

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